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60 lines
1.7 KiB
60 lines
1.7 KiB
import {StringUnion} from 'app/common/StringUnion';
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import {assert} from 'chai';
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describe('StringUnion', function() {
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// Create Dog type
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const Dog = StringUnion(
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"bulldog",
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"poodle",
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"greyhound"
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);
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type Dog = typeof Dog.type;
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// Create Cat type
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const Cat = StringUnion(
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"siamese",
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"sphynx",
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"bengal"
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);
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type Cat = typeof Cat.type;
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it('should provide check and guard functions', function() {
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let dog: Dog;
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let cat: Cat;
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const greyhound = "greyhound";
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const bengal = "bengal";
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const giraffe = "giraffe";
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// Use Dog check function.
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dog = Dog.check(greyhound);
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assert.equal(dog, greyhound);
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assert.doesNotThrow(() => { dog = Dog.check(greyhound); });
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assert.throws(() => { dog = Dog.check(bengal); },
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`Value '"bengal"' is not assignable to type '"bulldog" | "poodle" | "greyhound"'`);
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assert.throws(() => { dog = Dog.check(giraffe); },
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`Value '"giraffe"' is not assignable to type '"bulldog" | "poodle" | "greyhound"'`);
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// Use Cat check function.
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cat = Cat.check(bengal);
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assert.equal(cat, bengal);
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assert.doesNotThrow(() => { cat = Cat.check(bengal); });
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assert.throws(() => { cat = Cat.check(greyhound); },
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`Value '"greyhound"' is not assignable to type '"siamese" | "sphynx" | "bengal"'`);
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assert.throws(() => { cat = Cat.check(giraffe); },
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`Value '"giraffe"' is not assignable to type '"siamese" | "sphynx" | "bengal"'`);
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// Use Dog guard function.
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assert.isTrue(Dog.guard(greyhound));
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assert.isFalse(Dog.guard(bengal));
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assert.isFalse(Dog.guard(giraffe));
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// Use Cat guard function.
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assert.isTrue(Cat.guard(bengal));
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assert.isFalse(Cat.guard(greyhound));
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assert.isFalse(Cat.guard(giraffe));
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});
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});
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